1FW6 | pdb_00001fw6

CRYSTAL STRUCTURE OF A TAQ MUTS-DNA-ADP TERNARY COMPLEX

• PDB DOI: https://doi.org/10.2210/pdb1FW6/pdb
• NAKB: 1FW6

• Classification: REPLICATION/DNA
• Organism(s): Thermus aquaticus
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2000-09-21 Released: 2001-02-19 
• Deposition Author(s): Junop, M.S., Obmolova, G., Rausch, K., Hsieh, P., Yang, W.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 
  0.280 (Depositor) 
• R-Value Work: 
  0.218 (Depositor) 
• R-Value Observed: 
  0.218 (Depositor) 

Literature

Composite active site of an ABC ATPase: MutS uses ATP to verify mismatch recognition and authorize DNA repair.

Junop, M.S., Obmolova, G., Rausch, K., Hsieh, P., Yang, W.

(2001) Mol Cell 7: 1-12

• PubMed: 11172706 
• DOI: https://doi.org/10.1016/s1097-2765(01)00149-6
• Primary Citation Related Structures: 
  1FW6


• PubMed Abstract: 
  

  The MutS protein initiates DNA mismatch repair by recognizing mispaired and unpaired bases embedded in duplex DNA and activating endo- and exonucleases to remove the mismatch. Members of the MutS family also possess a conserved ATPase activity that belongs to the ATP binding cassette (ABC) superfamily. Here we report the crystal structure of a ternary complex of MutS-DNA-ADP and assays of initiation of mismatch repair in conjunction with perturbation of the composite ATPase active site by mutagenesis. These studies indicate that MutS has to bind both ATP and the mismatch DNA simultaneously in order to activate the other mismatch repair proteins. We propose that the MutS ATPase activity plays a proofreading role in DNA mismatch repair, verification of mismatch recognition, and authorization of repair.

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Organizational Affiliation: 
• Laboratory of Molecular Biology, National Institute of Diabetes and Digestive, and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892, USA.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 188.6 kDa 
• Atom Count: 13,165 
• Modeled Residue Count: 1,553 
• Deposited Residue Count: 1,581 
• Unique protein chains: 1
• Unique nucleic acid chains: 2

Macromolecules

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
DNA MISMATCH REPAIR PROTEIN MUTS	C [auth A], D [auth B]	768	Thermus aquaticus	Mutation(s): 13
UniProt
Find proteins for Q56215 (Thermus aquaticus) Explore Q56215  Go to UniProtKB:  Q56215

Entity ID: 1
Molecule	Chains	Length	Organism	Image
5'-D(*GP*CP*GP*AP*CP*GP*CP*TP*AP*GP*CP*GP*TP*GP*CP*GP*GP*CP*TP*CP*GP*TP*C)-3'	A [auth C]	23	N/A

Entity ID: 2
Molecule	Chains	Length	Organism	Image
5'-D(*GP*GP*AP*CP*GP*AP*GP*CP*CP*GP*CP*CP*GP*CP*TP*AP*GP*CP*GP*TP*CP*G)-3'	B [auth D]	22	N/A

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ADP	H [auth A], L [auth B]	ADENOSINE-5'-DIPHOSPHATE C10 H15 N5 O10 P2 XTWYTFMLZFPYCI-KQYNXXCUSA-N
SO4	F [auth A], G [auth A], I [auth B], K [auth B]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
MG	E [auth A], J [auth B]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	C [auth A], D [auth B]	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free:  0.280 (Depositor) 
• R-Value Work:  0.218 (Depositor) 
• R-Value Observed: 0.218 (Depositor) 

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 103.717	α = 90
b = 113.496	β = 90
c = 160.501	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2001-02-19 
Deposition Author(s): Junop, M.S., Obmolova, G., Rausch, K., Hsieh, P., Yang, W.

Revision History  

• Version 1.0: 2001-02-19
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2018-01-31
  Changes: Experimental preparation
• Version 1.4: 2024-11-13
  Changes: Data collection, Database references, Derived calculations, Structure summary